Q1. A thin, horizontal copper rod is 1.59347 m long and has a mass of 33.2472 g.
The acceleration of gravity is 9.8 m/s2.
What is the minimum current in the rod that will cause it to float in the horizontal magnetic field of 1.70872 T?
Q2. When a potential difference of 166 V is applied to the plates of a parallel-plate capacitor, the plates carry a surface charge density of 32.0 nC/cm2. What is the spacing between plates?